| #ifndef BLKTRACE_H |
| #define BLKTRACE_H |
| |
| #include <linux/types.h> |
| #ifdef __KERNEL__ |
| #include <linux/blkdev.h> |
| #include <linux/relay.h> |
| #endif |
| |
| /* |
| * Trace categories |
| */ |
| enum blktrace_cat { |
| BLK_TC_READ = 1 << 0, /* reads */ |
| BLK_TC_WRITE = 1 << 1, /* writes */ |
| BLK_TC_BARRIER = 1 << 2, /* barrier */ |
| BLK_TC_SYNC = 1 << 3, /* sync IO */ |
| BLK_TC_QUEUE = 1 << 4, /* queueing/merging */ |
| BLK_TC_REQUEUE = 1 << 5, /* requeueing */ |
| BLK_TC_ISSUE = 1 << 6, /* issue */ |
| BLK_TC_COMPLETE = 1 << 7, /* completions */ |
| BLK_TC_FS = 1 << 8, /* fs requests */ |
| BLK_TC_PC = 1 << 9, /* pc requests */ |
| BLK_TC_NOTIFY = 1 << 10, /* special message */ |
| BLK_TC_AHEAD = 1 << 11, /* readahead */ |
| BLK_TC_META = 1 << 12, /* metadata */ |
| BLK_TC_DISCARD = 1 << 13, /* discard requests */ |
| BLK_TC_DRV_DATA = 1 << 14, /* binary per-driver data */ |
| |
| BLK_TC_END = 1 << 15, /* only 16-bits, reminder */ |
| }; |
| |
| #define BLK_TC_SHIFT (16) |
| #define BLK_TC_ACT(act) ((act) << BLK_TC_SHIFT) |
| |
| /* |
| * Basic trace actions |
| */ |
| enum blktrace_act { |
| __BLK_TA_QUEUE = 1, /* queued */ |
| __BLK_TA_BACKMERGE, /* back merged to existing rq */ |
| __BLK_TA_FRONTMERGE, /* front merge to existing rq */ |
| __BLK_TA_GETRQ, /* allocated new request */ |
| __BLK_TA_SLEEPRQ, /* sleeping on rq allocation */ |
| __BLK_TA_REQUEUE, /* request requeued */ |
| __BLK_TA_ISSUE, /* sent to driver */ |
| __BLK_TA_COMPLETE, /* completed by driver */ |
| __BLK_TA_PLUG, /* queue was plugged */ |
| __BLK_TA_UNPLUG_IO, /* queue was unplugged by io */ |
| __BLK_TA_UNPLUG_TIMER, /* queue was unplugged by timer */ |
| __BLK_TA_INSERT, /* insert request */ |
| __BLK_TA_SPLIT, /* bio was split */ |
| __BLK_TA_BOUNCE, /* bio was bounced */ |
| __BLK_TA_REMAP, /* bio was remapped */ |
| __BLK_TA_ABORT, /* request aborted */ |
| __BLK_TA_DRV_DATA, /* driver-specific binary data */ |
| }; |
| |
| /* |
| * Notify events. |
| */ |
| enum blktrace_notify { |
| __BLK_TN_PROCESS = 0, /* establish pid/name mapping */ |
| __BLK_TN_TIMESTAMP, /* include system clock */ |
| __BLK_TN_MESSAGE, /* Character string message */ |
| }; |
| |
| |
| /* |
| * Trace actions in full. Additionally, read or write is masked |
| */ |
| #define BLK_TA_QUEUE (__BLK_TA_QUEUE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_BACKMERGE (__BLK_TA_BACKMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_FRONTMERGE (__BLK_TA_FRONTMERGE | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_GETRQ (__BLK_TA_GETRQ | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_SLEEPRQ (__BLK_TA_SLEEPRQ | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_REQUEUE (__BLK_TA_REQUEUE | BLK_TC_ACT(BLK_TC_REQUEUE)) |
| #define BLK_TA_ISSUE (__BLK_TA_ISSUE | BLK_TC_ACT(BLK_TC_ISSUE)) |
| #define BLK_TA_COMPLETE (__BLK_TA_COMPLETE| BLK_TC_ACT(BLK_TC_COMPLETE)) |
| #define BLK_TA_PLUG (__BLK_TA_PLUG | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_UNPLUG_IO (__BLK_TA_UNPLUG_IO | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_UNPLUG_TIMER (__BLK_TA_UNPLUG_TIMER | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_INSERT (__BLK_TA_INSERT | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_SPLIT (__BLK_TA_SPLIT) |
| #define BLK_TA_BOUNCE (__BLK_TA_BOUNCE) |
| #define BLK_TA_REMAP (__BLK_TA_REMAP | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_ABORT (__BLK_TA_ABORT | BLK_TC_ACT(BLK_TC_QUEUE)) |
| #define BLK_TA_DRV_DATA (__BLK_TA_DRV_DATA | BLK_TC_ACT(BLK_TC_DRV_DATA)) |
| |
| #define BLK_TN_PROCESS (__BLK_TN_PROCESS | BLK_TC_ACT(BLK_TC_NOTIFY)) |
| #define BLK_TN_TIMESTAMP (__BLK_TN_TIMESTAMP | BLK_TC_ACT(BLK_TC_NOTIFY)) |
| #define BLK_TN_MESSAGE (__BLK_TN_MESSAGE | BLK_TC_ACT(BLK_TC_NOTIFY)) |
| |
| #define BLK_IO_TRACE_MAGIC 0x65617400 |
| #define BLK_IO_TRACE_VERSION 0x07 |
| |
| /* |
| * The trace itself |
| */ |
| struct blk_io_trace { |
| __u32 magic; /* MAGIC << 8 | version */ |
| __u32 sequence; /* event number */ |
| __u64 time; /* in microseconds */ |
| __u64 sector; /* disk offset */ |
| __u32 bytes; /* transfer length */ |
| __u32 action; /* what happened */ |
| __u32 pid; /* who did it */ |
| __u32 device; /* device number */ |
| __u32 cpu; /* on what cpu did it happen */ |
| __u16 error; /* completion error */ |
| __u16 pdu_len; /* length of data after this trace */ |
| }; |
| |
| /* |
| * The remap event |
| */ |
| struct blk_io_trace_remap { |
| __be32 device; |
| __be32 device_from; |
| __be64 sector; |
| }; |
| |
| enum { |
| Blktrace_setup = 1, |
| Blktrace_running, |
| Blktrace_stopped, |
| }; |
| |
| #define BLKTRACE_BDEV_SIZE 32 |
| |
| /* |
| * User setup structure passed with BLKTRACESTART |
| */ |
| struct blk_user_trace_setup { |
| char name[BLKTRACE_BDEV_SIZE]; /* output */ |
| __u16 act_mask; /* input */ |
| __u32 buf_size; /* input */ |
| __u32 buf_nr; /* input */ |
| __u64 start_lba; |
| __u64 end_lba; |
| __u32 pid; |
| }; |
| |
| #ifdef __KERNEL__ |
| #if defined(CONFIG_BLK_DEV_IO_TRACE) |
| struct blk_trace { |
| int trace_state; |
| struct rchan *rchan; |
| unsigned long *sequence; |
| unsigned char *msg_data; |
| u16 act_mask; |
| u64 start_lba; |
| u64 end_lba; |
| u32 pid; |
| u32 dev; |
| struct dentry *dir; |
| struct dentry *dropped_file; |
| struct dentry *msg_file; |
| atomic_t dropped; |
| }; |
| |
| extern int blk_trace_ioctl(struct block_device *, unsigned, char __user *); |
| extern void blk_trace_shutdown(struct request_queue *); |
| extern int do_blk_trace_setup(struct request_queue *q, |
| char *name, dev_t dev, struct blk_user_trace_setup *buts); |
| extern void __trace_note_message(struct blk_trace *, const char *fmt, ...); |
| |
| /** |
| * blk_add_trace_msg - Add a (simple) message to the blktrace stream |
| * @q: queue the io is for |
| * @fmt: format to print message in |
| * args... Variable argument list for format |
| * |
| * Description: |
| * Records a (simple) message onto the blktrace stream. |
| * |
| * NOTE: BLK_TN_MAX_MSG characters are output at most. |
| * NOTE: Can not use 'static inline' due to presence of var args... |
| * |
| **/ |
| #define blk_add_trace_msg(q, fmt, ...) \ |
| do { \ |
| struct blk_trace *bt = (q)->blk_trace; \ |
| if (unlikely(bt)) \ |
| __trace_note_message(bt, fmt, ##__VA_ARGS__); \ |
| } while (0) |
| #define BLK_TN_MAX_MSG 128 |
| |
| extern void blk_add_driver_data(struct request_queue *q, struct request *rq, |
| void *data, size_t len); |
| extern int blk_trace_setup(struct request_queue *q, char *name, dev_t dev, |
| char __user *arg); |
| extern int blk_trace_startstop(struct request_queue *q, int start); |
| extern int blk_trace_remove(struct request_queue *q); |
| |
| #else /* !CONFIG_BLK_DEV_IO_TRACE */ |
| #define blk_trace_ioctl(bdev, cmd, arg) (-ENOTTY) |
| #define blk_trace_shutdown(q) do { } while (0) |
| #define do_blk_trace_setup(q, name, dev, buts) (-ENOTTY) |
| #define blk_add_driver_data(q, rq, data, len) do {} while (0) |
| #define blk_trace_setup(q, name, dev, arg) (-ENOTTY) |
| #define blk_trace_startstop(q, start) (-ENOTTY) |
| #define blk_trace_remove(q) (-ENOTTY) |
| #define blk_add_trace_msg(q, fmt, ...) do { } while (0) |
| |
| #endif /* CONFIG_BLK_DEV_IO_TRACE */ |
| #endif /* __KERNEL__ */ |
| #endif |